Browsing by Author "Townsend, L.J."

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    Identification of an X-Ray Pulsar in the BeXRB System IGR J18219-1347
    (IOP Publishing, 2022) O'Connor, B.; Göğüş, E.; Huppenkothen, D.; Kouveliotou, C.; Gorgone, N.; Townsend, L.J.; Calamida, A.; Fruchter, A.; Buckley, D.A.H.; Baring, M.G.; Kennea, J.A.; Younes, G.; Arzoumanian, Z.; Bellm, E.; Cenko, S.B.; Gendreau, K.; Granot, J.; Hailey, C.; Harrison, F.; Hartmann, D.; Kaper, L.; Kutyrev, A.; Slane, P.O.; Stern, D.; Troja, E.; Horst, A.J. van der; Wijers, R.A.M.J.; Woudt, P.
    We report on observations of the candidate Be/X-ray binary (BeXRB) IGR J18219−1347 with the Swift/X-ray Telescope, the Nuclear Spectroscopic Telescope ARray, and the Neutron Star Interior Composition Explorer during Type-I outbursts in 2020 March and June. Our timing analysis revealed the spin period of a neutron star with P spin = 52.46 s. This periodicity, combined with the known orbital period of 72.4 days, indicates that the system is a BeXRB. Furthermore, by comparing the spectral energy distribution of the infrared counterpart to that of known BeXRBs, we confirm this classification and set a distance of approximately 10–15 kpc for the source. The broadband X-ray spectrum (1.5–50 keV) of the source is described by an absorbed power law with a photon index Γ ∼ 0.5 and a cutoff energy at ∼13 keV.